Floor sanding machine



April 18, 1939.

A. IOBBl 221545620 FLOOR SANDING MACHINE Filed oop 4, 1935 2sheets-sheet 1 enten Il p "l waiter/12g,

April 18, 1939. A [055| 2,154,620

FLOOR SANDING MACHINE Filed Oct. 4, 1935 2 Sheets-Sheet 2 Inventor? l* 15 attorney,

Patented Apr. 18, 1939 UNiTED STATES PATENT OFFICE FLOOR SANDING MACHINEv Alfred Iobbi, Philadelphia, Pa.

Application October 4, 1935, Serial No. 43,516

3 Claims.

I have Various objects in mind to be fulfilled in improving a floorsanding machine of the class described. One cf these objects is toprovide such a construction of sanding drum shaft and its connectionswith the housing of the machine, as will enable the operator to quicklyrelease the drum from the housing for making a change in the sandingsheets, while at the same time, affording a positive and reliably fixedconnection for the drum shaft with the housing.

Another object of my invention is to provide within the sanding drum,spring-pressed clamping and drawing in means for securing the sandingsheet upon the drum.

A further object is to provide with the sanding drum, counterbalancingmeans, thereby permitting a greater speed with a balanced drum, so thata shorter drum can be used, having its high speed compensate in actionfor making the drum shorter for doing the same amount of work as thatdone by a longer and more slowly rotating drum. Besides I find that anoperator can better control his work using a higher speed for thesanding drum.

For equalizing wear on'the sanding sheet and for governing the sandingeffect upon the floor, I desire to fix the general position of thesanding drum, relative to the plane of the floor, by using tilting meanseffecting the mounting of the machine and its drum, relative to theplane of the floor, and I desire to accomplish this object by anadjustment of a single supporting roller, so that the weight of themachine will bear more heavily on one end of the sanding drum than onthe other.

Relative to the bag, into which the vacuum device discharges the dustand grit, it is important that the flow passage into the bag be freefrom any accumulation of dust and grit about its inlet, within the bag.In this connection my object is to form the flow passage in the bagwithout using a long, stiff inlet pipe, which is used with some bags,risingv within the bag. To form the inlet flow passage within the bag, Idesire to set oii such a passage, simply by sewing together, the sidewalls of the bag, near one vertical end thereof, so as to form the saidpassage as completely separate from the larger reservoir compartment, ofthe bag, having the lower end of this compartment slotted in the centralplane of the bag, for removing the waste. I provide a releasable closureby using a zipper fastener.

With these and other objects, which will appear hereinafter, myinvention resides in certain construction, one embodiment of which isillustrated 5 in the drawings. The Various features of construction arehereinafter described, their functioning is explained, and what I claimis set forth.

In the drawings,

Figure 1 is a side elevation of a complete floor W sanding machineembodying my invention.

Figure 2 is a front elevation of the machine shown in Figure l.

Figure 3 is a vertical section taken on the line 3-3 of Figure 1,showing the machine housing n,

and the adjustable supporting roller.

Figure 4. is a side elevation of the parts shown in Figure 3, having thetilted position of the housing and parts shown in dash and dot lines.

Figure 5 is a horizontal section taken on the 20 line 5--5 of Figure l,showing the bag construction.

Figure 6 is an enlarged elevation of the sanding drum.

Figure '7 is a vertical section taken on the 425 line 1 -1, of Figure 6.

Figure 8 is a front elevation of the fixed sander drum shaft, with itsmountings, showing the keying of the shaft at one end with the housing,and the plate retainer at the other end, on the v 30 housing.

Figure 9 is an end elevation of the shaft and housing illustrated inFigure 8, showing the keyed engagement of the shaft with the housing.

Figure 10 is an elevation of the retaining plate :35 with the housing,shown in Figure 8.

Figurell is a front elevation of one of the binder rods with itsspring-pressed mountings in the sander drum disc ends.

Figure l2 is a front elevation of the other of 40 the binder rods withthe disc mountings, showing its key receiving end.

Figure 13 is a sectional elevation of one of the drum discs, taken onthe line I3-I3 of Figure 14. "45

Figure 14 is a sectional elevation taken on the line Ill-I4 of Figure13.

Figure 15 is a perspective view of a cover portion of a drum disc. l

In the figures, the housing 20 is shown as .50 made of a bent plate,having a top portion 2|, and two depending side portions 2% and 23.Fixed upon the rear end of the top portion v2|, is a handle socket 24,having two transverse holes 25 and 26. The handle 21 fits this socket-65 24, and is secured therein by a cotter pin 28, passing through thehandle 21 and one or the other of the holes 25, 26, for adjusting theheight of the handle 21. More transverse holes than 25 and 26, can beprovided for greater adjustment of the handle height to suit the heightof the operator.

Mounted upon the top portion 2|, of the housing 28, is an electric motor29, to the shaft 30 of which is fixed a sprocket wheel 3|. A low handle32 is provided at the front end of the housing 28. Hinged to the frontend of the housing 20, is the curved cover or hood 33, for enclOS:

ing the upper part of the sanding drum 34.

The machine is supported in front, entirely by this drum 34, to the rearof lwhich are two supporting rollers 35 and 36, attached to therespective housing sides 22 and 23, opposite one another. The roller 35is journaled in ya forked frame 31, which with its angle iron portion38, is fixed to the side 22, while the roller 36Y is journaled in asimilar forked frame 39, which with its angle-iron portion 48 isadjustably attached to the housing side 23. 'Ihe angle-iron portion 40is pivoted to the side 23, by means of the screw 4|, passing through theforward end of the angleiron portion 4|). A long upright bolt 42 isadjustably held passing through the top of the rear end of the housing29, by means of the nuts 43 and 44, while the nuts 45 and 46 secure thebolt to the rear end of the angle-iron portion 40, of the forked frame39. The adjustment afforded by this one adjustably attached roller 36,is explained below, after giving a description of the remaining parts ofthe sanding machine.

Consideringy the construction of the sanding drum 34, and itsattachments, referring particularly to Figures 6-15 inclusive, the drum34 has two end discs 41 and 48, to which is attached, by screws 49, thecylindrical casing 56, positioned to come between the flanges and 52, ofthe respective discs 41 and 48. In each of the Vend discs 41 and 48, ismounted and secured centrally, a ball bearing 53, through which passesthe shaft 54. This shaft 54 has a tongue 55, at one end engaging a slothole 56, in the housing side portion 22, against which the shaft 54,releasably shoulders. The opposite end of Vthe shaft 54 releasablyengages a hole 51, in the housing side portion and butts against a plate58, releasably attached by screws 59, to the housing side portion 23.

Journaled in the end discs 41 and 48, against end displacement, is a keyrod 68, having a key end 6|, projecting into the outside pocket 62, forreceiving a turning key. The rod 68 is cut away to form a depressed ilatportion 63. This rod 60 is positioned within the casing 50 to adjoin andbe parallel with the inclined slot 64, through which is passed thesanding sheet 65. Adjoining the rod 68 is a spring pressed rod 66, eachend of which is mounted within an elongated pocket 61, having a springpocket 68, at right angles thereto. Within each spring pocket 68 is acoiled compression spring 69, adjustably held compressed against the endof the rod 66, by the screw 18. Above the screw 10, is an opening 1|,covered by a plate portion 12, of the disc, and is secured to theremaining portion of the disc by the screw 13. This plate portion 12also serves to support the part o the casing 59, which passes over theopening 1|. The rod 66, being spring pressed against the rod 60, formstherewith .1 ajspring pressed, inside clamp, to hold the sanding sheet65. Screws 34sl are provided to balance the drum 34.

Fixed by screws, concentric with the disc 48. and next to the housingside portion 23, is a sprocket wheel 14, in the plane of the sprocketwheel 3|. A sprocket chain 15 engages the sprocket wheels 3| and 14, andpasses through a slot 16, in the top of the housing 20. A guard 11covers the sprocket wheel 3| and chain 15, at its upper part.Surrounding the drum casing 50, is the sanding sheet 65, having its ends92 and 93, pass in through the inclined slot 64 and become engaged bythe clamping rods 68 and 66. Between the sheet 65 and the casing 50 is athick sheet rubber cushion 18.

Within the housing is mounted the vacuum cleaner 19, with its suctionfan and independent motor. Its suction mouth 80, adjoins the sandingdrum 34. To the discharge outlet 8|, of the vacuum cleaner 19, isreleasably attached the neck 82 of the bag 83, which is hung upon thehook 84, ori the handle 21. The strap 85, attached to the bag 83,releasably engages the hook 84. The bag 83 has an outer edge seam 86 inits central plane. Extending vertically in the side of the wall of thechamber 9| is the zipper closure 81, for releasably opening this part ofthe bag, to empty the accumulated contents, as 88. I form a verticalnarrow passage 89, in the bag 83, by sewing together the side walls ofthe bag along the line 90, which, while running mainly upright andapproximatelyparallel with the front edge of the bag 83, curves forwardat its lower end to form a bend in the passage, merging with the neck82, of the bag 83, while the upper end of the stitching line 90 isspaced from the upper edge of the bag 83, and terminates after turning ashort distance, to the rear, Where the passage 89, so formed, mergesVinto the top part of the bag chamber 9|, separated from the passage 89,by the stitching line 90.

Before beginning to operate the machine, the sanding drum 34 is removed.The plate 58 is taken off, so that the shaft 54 can be withdrawn throughthe hole 51, in the housing side 23, thus permitting the sanding drum 34to drop free of the machine. Having this drum 34 free, the rubber sheet18 is next wrapped around the cylindrical casing 50 to have its inclinededges meet the edges of the inclined slot 64, in the casing 50.Next,=after wrapping the sanding sheet 65 around the rubber sheet 18, onthe casing 50, the sanding sheet ends 92 and 93 are inserted together inthe slot 64, of the casing 50, and with the rod 60, so turned, that itsflat portion 63 is opposite the rod 66, affording a space, into whichthe ends 92 and 93, ofthe sheet 65, are passed. The rod 68 is nextengaged at its key end 6| by a suitable key, then the rod 66 is turnedin a direction to draw in the ends 92 and 93, of the sanding sheet 65,until the same are tightly drawn. During this drawing-in operation, therod 66, on account of being spring pressed, toward the rod 68, exerts aside pressure against the sanding sheet ends 92 and 93. This pressurealso serves to increase the side friction of the rod 60, Within -its endbearings, to hold the rod 60 from turning by itself, and releasing thegrip upon the sanding sheet 65. Having thus provided the drum 34 withthe desired sanding sheet, the drum is next returned to its properposition in the machine, to have its axis coincide with the hole 51 Landthe slot 56, when the shaft 54 is inserted successively through the hole51, the sprocket wheel-14, the discs 48 and 41, and their bearings 53,having the tongue 55, of the shaft 54, engage the-slot hole 58, in thehousing side 22. The plate 58 is next screwed back in place upon thehousing side 23, to keep the shaft 54 from moving endwise within thehousing 20. With this sprocket chain 15. properly engaging the sprocketwheels 3l and 14, the motor can turn the drum 34.

Now, having the drum 34, back in place, prepared for the operation, theoperator, by means of the nuts 43, 44, on the bolt 42, next adjusts theheight of the housing 20 relative to the roller 36, as it stands uponthe iloor 94. In Figure 4 such a relatively changed position of theparts 20, 2l, 23, 36, 42 and 43, from full line positions to the dashand dot line positions, is respectively indicated at 20a, 2|, 23a, 36,42a, and 43a, assuming for these changed positions that the drum 34 hasremained upon the floor 94. It will be noted that for the changedposition, just indicated, that relative to the housing side 23, theangle-iron 40 has turned outwardly. Such a position will cause a certaintilt to the sanding drum 34, relative to the oor 94, while an oppositeturning adjustment to the angle-iron 40, causing it to turn inwardlywith respect to the housing 20, will result in an opposite tilt to thesanding drum 34, thus affording a variety of slight angular adjustmentsof the sanding drum 34, relative to the floor 94, to govern the sandingoperation effect upon the floor.

Referring to the use of the bag 83, the incoming dust and grit passes inthe direction of the arrows shown in Figure 1, coming in through theneck 82 and the free passage 89, up and over into the collection chamber9|, having the zipper 81 closed. The stitching together of the sidewalls of the bag 83 along the line 90, particularly at its lower endkeeps the accumulated dust and dirt, as at 88, from piling up in thelower end of the passage 89, leaving the passageways 82 and 89 alwaysclear.

The speed at which the drum 34 turns, governs, to a great extent, therapidity and quality of the work done. I prefer to turn the drum 34 at ahigh speed, so as to make a relatively short sanding drum do the samework as a longer drum would if it ran slower.

While I have illustrated and described but one embodiment of myinvention, various changes and additions can be made without departingfrom the spirit and scope thereof. I therefore wish to include all formswhich come within the purview of the following claims.

I claim:

1. A oor sanding machine including in combination, a housing, a motor onsaid housing, a sanding drum journaled on said housing, a sanding sheetenveloping said drum, means connecting said motor with said drum torevolve the same, a roller bracket, a supporting roller journaled onsaid bracket, said bracket being fixed to one side of said housing, tothe rear of said drum, a second roller bracket, a second supportingroller journaled on said second roller bracket, said second rollerbracket having a longitudinal, upper portion, at an angle to thevertical, approximately horizontal, one end of said longitudinal portionbeing pivoted on a lower portion of said housing, a depending portion'to said bracket, below said longitudinal portion, and to which saidsecond roller is journaled, at a point positioned below said pivoted endof said longitudinal portion, and off-set from a vertical line passingthrough the pivotal connection of said bracket with said housing,adjusting means for adjustably fixing that end of said longitudinalportion opposite to the pivoted end thereof with said housing, wherebysaid second roller lcan be adjusted relative to said housing and to theline of contact of said drum, with said floor.

2. A floor sanding machine made in accord- Iance with claim 1 whereinthe said adjusting means comprises, a bolt having one end connected withsaid second roller bracket and having its opposite end adjustablyconnected with said housing.

3. In a floor sanding machine having a housing with spaced sides and asanding drum therebetween, said sanding drum including drum ends uponwhich is mounted a cylindrical casing, a shaft passing through said drumand having ends concentric to said casing and upon which said drum endsare journaled, a keying and shouldering formation at one end of saidshaft, a second formation in one of said housing sides adapted to bereleasably engaged by said keying and shouldering formation on saidshaft in shouldered relation thereto to hold said shaft from turning,the opposite housing side to that having the keying and shoulderingformation having a hole therethrough, into which said shaft enters andthrough which said shaft is adapted to pass and stop means positioned atthe outer end of said hole releasably attached to the housing sidehaving said hole, whereby said shaft is releasably held in said housingagainst endwise displacement.

ALFRED IOBBI.

